Analog Electronics MCQ Questions & Answers

21

A change in the value of the emitter resistance Re in a differential amplifier

A) Affects the difference mode gain Ad B) Affects the common mode gain Ac C) Affects both Ad and Ac D) Does not effect either Ad and Ac

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Answer & Solution

Answer: Option B

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22

The bandwidth of an RF tuned amplifier is dependent on

A) Q-factor of the tuned output circuit B) Q-factor of the tuned input circuit C) Quiescent operating point D) Q-factor of the output and input circuits as well as quiescent operating point

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Answer & Solution

Answer: Option A

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23

Introducing a resistor in the emitter of a common amplifier stabilizes the dc operating point against variations in

A) Only the temperature B) only the β of the transistor C) Both Temperature & β D) None of the above

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Answer & Solution

Answer: Option C

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24

The MOSFET switch in its onstate may be considered equivalent to

A) Resistor B) Inductor C) Capacitor D) Battery

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Answer & Solution

Answer: Option A

Solution:

Explanation:
The MOSFET switch in its on state behaves like a resistor. When the MOSFET is on, the conducting channel is established between the drain and source terminals, and it allows current to flow through it with minimal resistance, making it act as a low-value resistor. Therefore, the correct answer is Option A: Resistor.

Why the other options are incorrect:
Option B: Inductor – An inductor stores energy in a magnetic field when current passes through it. A MOSFET in the on state does not function in this manner.

Option C: Capacitor – A capacitor stores energy in an electric field and releases it when the circuit conditions change. This is not the behavior of a MOSFET in the on state.

Option D: Battery – A battery provides a constant voltage or current in a circuit, whereas a MOSFET switch in its on state allows current to flow with minimal resistance, similar to a resistor, not a voltage source.

25

Most of the linear ICs are based on the two-transistor differential amplifier because of its

A) Input voltage dependent linear transfer characteristic B) High voltage gain C) High input resistance D) High CMRR

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Answer & Solution

Answer: Option D

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26

The horizontal intercept of dc load line is the same as ideal

A) Cut off point B) Saturation point C) Operating point D) Quasi saturation point

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Answer & Solution

Answer: Option A

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27

A 741-type OP-amp has a gain-bandwidth product of 1MHz. A non-inverting amplifier using this OP-amp & having a voltage gain of 20 db will exhibit -3 db bandwidth of

A) 50 KHz B) 100 KHz C) $$\frac{{1000}}{{17}}{\text{KHz}}$$ D) $$\frac{{1000}}{{7.07}}{\text{KHz}}$$

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Answer & Solution

Answer: Option B

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28

A differential amplifier is invariably used in the input stage of all OP-amps. This is dome basically to provide the OP-amps with a very high

A) CMRR B) Bandwidth C) Slew rate D) Open-loop gain

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Answer & Solution

Answer: Option A

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29

The early effect in a bipolar junction transistor is caused by

A) Fast turn-on B) Fast turn-off C) Large collector-base reverse bias D) Large emitter-base forward bias

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Answer & Solution

Answer: Option C

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30

In a transistor leakage current mainly depends on

A) Doping of base B) Size of emitter C) Rating of transistor D) Temperature

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Answer & Solution

Answer: Option D

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Analog Electronics MCQ Questions & Answers | ECE